What Causes Gradual Drop In TSH Levels?

I started having severe symptoms of hyperthyroidism about 2 years ago. In 2011 my TSH levels have dropped from 2.02, 1.35, 1.45. 1.25 to a present level of .63. My T3 is .77. In Dec. 2014, I was told I had a pituitary tumor by my Primary care dr. and was referred to a neurologist, who ran a battery of tests, all with normal results. I, then saw an endocrinologist and I tried to discuss this with her and she seemed to think I just don t understand how to interpret the tests. I am above average intelligence and have worked in the medical field and do know how to read lab values. I need help finding a doctor in the Atlanta, Ga. area that will listen to me and investigate this problem with more tests before telling me there is nothing wrong with me.